Old or many times regenerated artificial pure forest will lead to imbalance of nutrients and degeneration of its soil due to the trees selective absorption and utilization of nutrients.

The results showed that the microorganisms in the four artificial pure forests of Qinling Mountains were of great difference in the total quantity.

The rectangle and isosceles triangle are two main kinds of arrangement of pure artificial even aged stand,according to correlative relationship between crown area and forest area of pure artificial even aged stand theoretical canopy density of stand between different row and intertree space are inferred and calculated.

Wood physical-mechanical properties of Taiwania flousiana compared to Cunninghamia lanceolata for plantation development;

Shrinkage of smallwood of Cryptomeria japonica and Cunninghamia lanceolata plantation;

Mechanical properties of juvenile and mature wood of Pinus densiflora from plantations;

Infiltrability of muddy water and universal model for both muddy water and tap water in planted forest site;

Soil fertility evaluation of planted forest land on the hilly-gullied Loess Plateau;

Quantity characteristics of plant community under tree-layers of planted forests in semi-arid windy area of north Shaanxi Province;